* {
    padding: 0;
    margin: 0;
    border: 0;
}

.banner {
    overflow: hidden;
    position: relative;
}

    .banner .nav {
        position: fixed; /* 让nav div 固定在屏幕的顶部 */
        top: 0px;
        /* left: 50%; */
        /* margin-left: -560px; */
        width: 100%;
        z-index: 1111;
    }

.scrollToTopNav {
    background-color: #9f9f9f;
}

.banner .nav .logo {
    width: 108px;
    height: 60px;
    float: left;
    margin-right: 60px;
    margin-left: 20%;
}

.banner .nav .nav_list {
    padding-top: 15px;
}

.banner .nav .nav_item {
    padding-top: 15px;
    font-size: 18px;
    color: #000;
    padding-right: 30px;
    text-decoration: none;
}

    .banner .nav .nav_item:hover {
        text-decoration: underline;
    }

.banner .login {
    position: absolute;
    right: 20%;
    top: 15px;
}

    .banner .login .login_item {
        text-decoration: none;
        font-size: 18px;
        color: #000;
        padding: 0 10px;
        cursor: pointer;
    }

        .banner .login .login_item:hover {
            text-decoration: underline;
        }

.banner .actions {
    position: absolute;
    top: 80%;
    left: 50%;
    margin-left: -120px;
    display: inline-block;
    width: 240px;
    line-height: 64px;
    font-size: 30px;
    color: #fff;
    background: #278f64;
    border-radius: 64px;
    text-decoration: none;
    text-align: center;
}

    .banner .actions:active {
        top: 79%;
    }

    .banner .actions:hover {
        background-color: #37976f;
    }

.bgImg {
    width: 100%;
    float: left;
}

.cotainer {
    width: 1120px;
    margin: 0 auto;
}

    .cotainer .class_title {
        padding-top: 90px;
        padding-bottom: 50px;
        text-align: center;
    }

        .cotainer .class_title h2 {
            font-size: 30px;
            color: #333;
            padding-bottom: 10px;
        }

        .cotainer .class_title span {
            font-size: 16px;
            color: #333;
            line-height: 23px;
        }

    .cotainer .class_list {
        width: 100%;
        overflow: hidden;
    }

    .cotainer .clss_more {
        padding-bottom: 120px;
    }

    .cotainer .class_item {
        position: relative;
        float: left;
        margin-right: 20px;
        width: 265px;
        height: 283px;
        /* background: url(../images/tu11.png) no-repeat; */
        overflow: hidden;
        background-size: 265px 283px;
    }

        .cotainer .class_item:hover .class_bg {
            top: 0;
            transition: all .5s ease;
        }

.class_bg_img1 {
    background: url(../images/tu11.png) no-repeat;
}

.class_bg_img2 {
    background: url(../images/tu22.png) no-repeat;
}

.class_bg_img3 {
    background: url(../images/tu33.png) no-repeat;
}

.class_bg_img4 {
    background: url(../images/tu44.png) no-repeat;
}

.cotainer .class_item .class_bg {
    position: absolute;
    top: 283px;
    left: 0;
    width: 265px;
    height: 283px;
    background: rgba(0, 0, 0, 1);
    opacity: 0.58;
    transition: all .5s ease;
}

.cotainer .class_item:last-child {
    margin-right: 0;
}

.cotainer .class_item .class_btn {
    margin: 45px auto;
    width: 167px;
    background: #278f64;
    border-radius: 4px;
    display: block;
    line-height: 45px;
    text-align: center;
    text-decoration: none;
    font-size: 20px;
    color: #fefefe;
}

.cotainer .class_bg > p {
    padding: 0 22px;
    font-size: 14px;
    color: #fefefe;
}

.use_lsit .use_top {
    overflow: hidden;
}

    .use_lsit .use_top img {
        float: left;
        width: 100%;
        height: 100%;
    }

    .use_lsit .use_top .useone {
        width: 680px;
        height: 240px;
        padding-right: 10px;
    }

    .use_lsit .use_top .usetow {
        width: 430px;
        height: 240px;
    }

.use_lsit .use_bottom {
    padding-top: 10px;
    overflow: hidden;
}

    .use_lsit .use_bottom .useone {
        float: left;
        width: 365px;
        height: 240px;
        padding-right: 12px;
    }

        .use_lsit .use_bottom .useone:last-child {
            padding-right: 0;
        }


.footer {
    padding-bottom: 20px;
    text-align: center;
    height: 78px;
    background: #dedede;
    /* color: #333333; */
}

    .footer .link {
        padding: 20px 8px;
    }

        .footer .link a {
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

    /* .footer .aboutUs, .footer .copyRight {
	font-size: 14px;
	line-height: 1.5;
} */

    .footer .aboutUs {
        font-size: 18px;
        color: #7b7b7b;
        padding-top: 18px;
    }

    .footer .copyright {
        margin-top: 14px;
        font-size: 15px;
        color: #C0C0C0;
    }
